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I would say forget about the AP if economy mode is your deciding factor in the purchase, if saving gas is what your into then keep your right foot in check. The AP is designed to enhance performance and while it offers an economy mode, the money you spend on the AP will not get recouped by the gas savings in economy mode (IMHO).

I spoke with a couple people on this, and they found no signficiant increase (maybe 1-2MPG).

I did fine, however, after getting my UTEC tuned (not ecnonmy tuned, just tuned for driveability and a bit mroe power) on my otherwise stock car that my mileage went up by about 2MPG if I am careful with the throttle.

There are quite a few people who claim a 1-2 MPG increase on the Stg2 91 or 93 octane maps. The rest are probably a little heavier on the right foot and lose any gains. The Economy map is not your friend though and serves little purpose. Really want to save gas around town? Run the valet map. JK. But I'm sure it's the only map that will actually give you a noticeable difference.

Well, when I had a DP, and UP with high flow filter I would get about 250 per tank; about 18 MPG, with all city driving. Then I moved and started doing a mix of city and highway and the mileage jumped to about 22.5 MPG. Then I got the AP stage 2 and for a while it was around 22, then the new maps came out v1.22 and now it blows. I get about 17 now with normal pretty easy driving. I think it has something to do with revisions that were made to the CL/OL fueling switch.